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Modality shares its root with the word mode, meaning the way in which something happens or is experienced. A sensory modality is a way of sensing, like vision or hearing. Modality in someone's voice gives a sense of the person's mood. In logic, modality has to do with whether a proposition is necessary, possible, or impossible.
By Richard Nordquist. Definition: Linguistic devices that indicate the degree to which an observation is possible, probable, likely, certain, permitted, or prohibited. In English, these notions are most commonly expressed by modal auxiliaries, sometimes combined with not. See also: 1  Aspect. 2  Lexical Modality. 3  Marginal Modal. 4  Modal. 5  Mood.